Convert Struct to Map Example

struct-to-map.go

func ConvertStructToMap(st interface{}) map[string]interface{} {

	reqRules := make(map[string]interface{})

	v := reflect.ValueOf(st)
	t := reflect.TypeOf(st)

	for i := 0; i < v.NumField(); i++ {
		key := strings.ToLower(t.Field(i).Name)
		typ := v.FieldByName(t.Field(i).Name).Kind().String()
		structTag := t.Field(i).Tag.Get("json")
		jsonName := strings.TrimSpace(strings.Split(structTag, ",")[0])
		value := v.FieldByName(t.Field(i).Name)

		// if jsonName is not empty use it for the key
		if jsonName != ""  && jsonName != "-" {
			key = jsonName
		}

		if typ == "string" {
			if !(value.String() == "" && strings.Contains(structTag, "omitempty")) {
				fmt.Println(key, value)
				fmt.Println(key, value.String())
				reqRules[key] = value.String()
			}
		} else if typ == "int" {
			reqRules[key] = value.Int()
		} else {
			reqRules[key] = value.Interface()
		}

	}

	return reqRules
}

Thanks for the code! Would just like to suggest one change here

if jsonName != "" {
	key = jsonName
}

Change:

if jsonName != "" && jsonName != "-"{
	key = jsonName
}

Thanks for sharing rajan! I haven't even looked at this for awhile. I will make the change.

any example for reverse?
ConvertMapToStruct(mp map[string]interface{}, &Address{})

How about recursively convert if a field contains another struct?

@xmlking try github.com/mitchellh/mapstructure